.navbar-sider a{
    padding-top:8px;
    padding-bottom:8px;
    border:hidden;
    font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
    font-size: 18px;
    line-height: 20px;
    color: #444;
}

.main {
    margin: 110px 30px 30px 30px;
    font-size: 16px;
}

.navbar-sider {
    margin-left: -20px;
    border: hidden;
    border-right: 1px solid grey;
}

.catalog{
    margin-top: -20px;
    font-weight: 900;
    font-size: 24px;
}

p.chapter-title {
    font-weight: 400;
    font-size: 24px;
}

hr {
    margin: 5px auto;
}

